小弟我要抓取页面的信息。大家给点思路

我要抓取页面的信息。大家给点思路
我要抓取页面的信息。但url重新过了。
http://flights.ctrip.com/booking/bjs-sha----adu-1/?dayoffset=7&ddate1=2013-01-12&dcityname1=%u5317%u4eac&acityname1=%u4e0a%u6d77
我用了很笨的办法。把页面保存在本地。然后读取，用正则匹配
WebClient wc = new WebClient();
string html = wc.DownloadString(url);
////////////
当我用webClient直接读取网上的页面的时候很多很多内容读取不到。

保存在可这远远不够。我想直接去读取那个页面。然后匹配。下载源代码。是不是要读取流才能做到，大家给我点思路。谢谢
[解决办法]
    string whereUrl = "dayoffset=7&ddate1=2013-01-12&dcityname1=%u5317%u4eac&acityname1=%u4e0a%u6d77";
            html = HttpPost1("http://flights.ctrip.com/booking/bjs-sha----adu-1/",whereUrl);
            Response.Write(html);
        }
        public string HttpPost1(string url, string param)
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.Accept = "*/*";
            request.Timeout = 50000;
            request.AllowAutoRedirect = false;

            StreamWriter requestStream = null;
            WebResponse response = null;
            string responseStr = null;

            try
            {
                requestStream = new StreamWriter(request.GetRequestStream());
                requestStream.Write(param);
                requestStream.Close();

                response = request.GetResponse();
                if (response != null)
                {
                    StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("GB2312"));
                    responseStr = reader.ReadToEnd();
                    reader.Close();
                }

            }
            catch (Exception)
            {
                throw;
            }
            finally
            {
                request = null;
                requestStream = null;
                response = null;
            }
            return responseStr;
        }
解决了
[解决办法]
我说好像少了什么叫，刚才把for给扔了……

HtmlDocument objDoc = webBrowser1.Document;
for (int i = 0; i < objDoc.All.Count; i++){
    if (objDoc.All[i].TagName.ToLower().Equals("html"))
    {
      richTextBox1.Text = objDoc.All[i].InnerHtml;
      break;
    }
}